Regardless of what form symptoms take (SKIN RASH, tingling around the MOUTH, DIARRHEA), a type I hypersensitivity reaction is a systemic response-it affects and involves the body as a whole.
How to Read Your Eyeglass Prescription. The first step to understanding your eyeglass prescription is knowing what OD and OS mean. They are abbreviations for oculus dexter and oculus sinister, which are Latin terms for right eye and left eye.
OD is oculus dexter = right eye. OS is oculus sinister = left eye. They're usually listed right eye first because your right eye is the left one from the viewpoint of the person writing the prescription. Written Apr 24 Â· View Upvotes.